Grinding



(No Model.) l 2 Sheets-Sheet l.

M. P. BOSS.

GRINDING PAN.

No. 398,936.. Patented Mar. 5, 1889 f '9 9 I f f N. PETKRS. Pmm-Lnhogmpher. wmingmn Dv C.

(No Model.) 2 Sheets-Sheet 2. M. P. BOSS.

GRINDING. PAN.

Patented Mar.. 5, 1889.

A UNITED STATES ATnnT @ritieni MARTIN PROR BOSS, Ol" SAN FRANCISCO, ClALlFORNli-X.

GRiNDlNG-PAN.

SPECIFICATION forming partI of Letters Patent No. 398,936, dated March 5, 1889.

Application filed May 4, 1888. Serial No. 272,822. (No modeid '0 @ZZ whom, it may oaneern:

n@ a known that I, MARTlN Pinon Boss, of

`: muller the screw H is turned down, so that ment in wr'rinding-Pans; and I hereby declare f the following to be a full, clear, and exar't deseription thereof.

My invention relates 1o that class of pans i'or grinding ore in which a muller rotates within the pan and crushes the ore between its shoes and the dies of the pan; and my invention consists in the constructions and oombinations of deviees which I shall hereinafter fully describe and claim.

Referring to the accompanying drawings, Figure l is a vertical section of my grindingpan. Figui? is a top view of the shoe. Fig, 3 is a top view of the die. Fig. 4 is a section of a part of the shoe and die through the slots c and b on the line y y of 2 and 3. Fig. 5 is a section of the lug o on the shoe C through the line 2 s on Fig, 2.

A is the pan, having an opening', u, in the base of its rim, no plug being used as in ordinary pans.

B is the die in the pan.

C is the shoe of the muller.

D is the muller, the driver or stem d of which i extends upwardly, and is secured to the drivethe nut G moves up and through the spring I raises the driver-cap F and muller driver or stem d. The reverse movement of the serew H allows the innller to move down. The spring, therefore, receives the thrust ot the screw to adjust the muller. By these means, as before mentioned, the pressure or weight of the shoe while grinding is regulated at will to increase or decrease the feed, as well as to determine the iineness of the grinding.

The die B in the pan is a ring or annular die, and in its inner surface are made the inclined grooves ZJ, which, instead of extending all the way aeross the die, as do the intervening passages in the dies of the ordinary pan, terminate at a short distance from the inner surface.

The shoe C of the muller is a ring or annular shoe, and in its inner surface are made the inclined grooves c, ot1 a character similar to the grooves b of the die and similarly located-that is to say, they do not extend all the wa)T across the shoe.

The muller D is an annular one, having a solid body connected with its central stem, d,

1 by arms d', and it has an inwardly-turned flange, d?, at its top. It is eonneoted with the l shoe C by means of bolts d3, the heads of which shaft E in suitable manner, as b v a feather or i feathers, so that it may be rotated by Sai-(1 sliaft,lmt1naystill have a vertical movement f i joint formed between the foot of the muller for raising or lowering its shoe.

l" is a driver-cap resting on top oi the muller driver or siem, and connected therewith by bolts f, whieh are secured at their lower ends to the muller-driver stem, and their upper ends, passing through the sides of the cap, have seeming-mits j". lithin the eap is a nut, G.

'lts upper end passes through the top of the eap and receives a nui, g, so that said nutl ma;T move np and down in the eap.

H is the adjnstingserew,whioh passes down through the nut G and has its lower end hear- 1 bit of it is once subjeeted to the grinding aeing on the top of the drive-shaft E.

I is a spring located within the driver-Cap 5 F and around the nut G.

Its base bears on i the flanged of the nut and its top bears I are confined in grooved lugs c on the shoe, and their ends pass through ears d'1 on the muller and reeeive nuts da, as shonn. A t1 ght and its shoe by the intervention oi a packingring or gasket, .'l.

The pulp is fed into the Center ol the muller, and is Confined therein. lt thence passes down and is direoted by the inc-,lined grooves c 'b to and between the shoe and die, and

thence, being ground, passes directly out of the pan through the opening a. It will be seen that this is the onliv eourse open for the pulp. lt. eau pass out in no other way but, between the shoe and die, and therefore everv tion, and once only. In man); of the ordinary pans the pulp fed into and fills the pan itself, and some portions may pass between the shoes and dies man3` times before other portions are subj eeted IOO to the grinding action at all; but in my pan the shape of the muller so connes and directs the pulp that it has to follow the course described, and every bit of it is ground successively iu its passage to the discharge.

Having thus described my invention, Wh at I claim as new, and desire to secure by Letters f Patent, is-

l. In a grinding-pan, a inuller having the stein d, and the drive-shaft E, passing into said stein and adj ustably connected therewith, whereby the muller is rotated and is adapted to niove vertically, in combination with the 2. lIn a grindingepan, the combination of a pan, a drive-shaft and operative mechanism therefor, a die, a centrally-apertured shoe, and a muller having an apertured -annular body and inwardly-curved liange d2, for confining and` directing the pulp between the shoe and die, substantially as herein described.

3. In a grinding-pan, and in combination with the pan having a die in its bottom and a discharge-opening in the base of its rim, the annular muller for conning the pulp, and having a centrally-apertured shoe on its foot. operating overl the die for directing the pulp outwardly between the shoe and die to the discharge-opening, said muller having an inwardly-curved flange, d2, substantially as described.

In Witness whereof I have hereunto set my hand.

MARTIN PRIOR Boss.

Witnesses:

S. H. N oURsE, J. H. BLOOD. 

